[SFDXA] Balloon detects first signs of a ‘sound tunnel’ in the sky

[Bill]

  /Interesting article found by Steve NN4X/


  Balloon detects first signs of a ‘sound tunnel’ in the sky


    Atmospheric analog to ocean’s acoustic channel could be used to
    monitor eruptions and bombs

https://www.science.org/content/article/balloon-detects-first-signs-sound-tunnel-sky


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